−50%What Makes Muscles Get Tired
Iris Fennimore · narrated by Duncan Winslow
2026
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A boy sprints until his legs turn to jelly, then learns why his muscles feel like they're full of buzzing bees. Iris Fennimore explains the real science of fatigue using race tracks, cluttered desks, and dancing calcium so kids aged seven to ten can follow every step. Duncan Winslow reads with the steady patience of a favorite teacher, pausing just long enough for a young listener to picture oxygen's long journey from lungs to biceps. Perfect for children who ask "why" after every soccer practice.
17 chapters
- 1Before We Start3m
- 2Chapter 1: Waking Up Wired15m
- 3Chapter 2: The Muscle Map13m
- 4Chapter 3: Fuel on the Inside16m
- 5Chapter 4: Oxygen's Long Journey13m
- 6Chapter 5: The Acid Rumor19m
- 7Chapter 6: The Cluttered Desk18m
- 8Chapter 7: Calcium's Tiny Dance19m
- 9Chapter 8: The Energy Bank Account17m
- 10Chapter 9: When the ATP Runs Low18m
- 11Chapter 10: The Ion Traffic Jam16m
- 12Chapter 11: A Warm Bath of Discovery14m
- 13Chapter 12: Sleep's Quiet Repair14m
- 14Chapter 13: The Training Secret12m
- 15Chapter 14: Stronger Than Yesterday15m
- 16About Iris Fennimore2m
- 17Where to Go From Here1m
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